Refurbished HP RM1-2566 Guaranteed working 90 day warranty on ECU Board This is sold as refurbished Engine control unit ECU PC board assembly - Includes the PC board bottom pan and standoffs For 110V to 127V operation - Does NOT includes the power cord connector or power switch - Mounts in the bottom of the printer Works in all hp: LASERJET 3390 ALL-IN-ONE Q6500A Q6500AR HP LASERJET 3392 ALL-IN-ONE Q6501A Q6501AR